//
//  WelcomeViewController.swift
//  LBWeibo
//
//  Created by 李博 on 15/6/27.
//  Copyright © 2015年 libo. All rights reserved.
//

import UIKit
import SDWebImage

class WelcomeViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        //设置头像
        if let urlString = sharedUserAccount?.avatar_large {
            iconView.sd_setImageWithURL(NSURL(string: urlString))
        }
    }
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        bottomConstraint?.constant = -(UIScreen.mainScreen().bounds.height - 200)
        
        UIView.animateWithDuration(2, delay: 0, usingSpringWithDamping: 0.8, initialSpringVelocity: 5.0, options: UIViewAnimationOptions.CurveEaseInOut, animations: {
            
            self.view.layoutIfNeeded()
            
            }) { (_) -> Void in
                
                UIView .animateWithDuration(1.0, animations: {
                    
                    self.messageLabel.alpha = 1.0
                    }, completion: { (_) -> Void in
                        
                    // object = true 表示显示 MainViewController
                    //注册通知
                    NSNotificationCenter.defaultCenter().postNotificationName(LBSwitchRootVCNotification, object: true)
                })
        }
    }
    
    
    /// 头像的底部约束
    var bottomConstraint: NSLayoutConstraint?

    override func loadView() {
        
        view = UIView()
        
        let backImageView = UIImageView(image: UIImage(named: "ad_background"))
        view.addSubview(backImageView)
        view.addSubview(iconView)
        view.addSubview(messageLabel)
        
        //设置自动布局
        backImageView.translatesAutoresizingMaskIntoConstraints = false
        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[subView]|", options: NSLayoutFormatOptions.AlignAllBaseline, metrics: nil, views: ["subView" : backImageView]))
        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|[subView]|", options: NSLayoutFormatOptions.AlignAllBaseline, metrics: nil, views: ["subView" : backImageView]))
        
        iconView.translatesAutoresizingMaskIntoConstraints = false
        view.addConstraint(NSLayoutConstraint(item: iconView, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterX, multiplier: 1.0, constant: 0))
        bottomConstraint = NSLayoutConstraint(item: iconView, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Bottom, multiplier: 1.0, constant: -160)
        view.addConstraint(bottomConstraint!)
        
        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:[subView(90)]", options: NSLayoutFormatOptions.AlignAllBaseline, metrics: nil, views: ["subView" : iconView]))
        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[subView(90)]", options: NSLayoutFormatOptions.AlignAllBaseline, metrics: nil, views: ["subView" : iconView]))
        
        messageLabel.translatesAutoresizingMaskIntoConstraints = false
        view.addConstraint(NSLayoutConstraint(item: messageLabel, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: iconView, attribute: NSLayoutAttribute.CenterX, multiplier: 1.0, constant: 0))
        view.addConstraint(NSLayoutConstraint(item: messageLabel, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: iconView, attribute: NSLayoutAttribute.Bottom, multiplier: 1.0, constant: 0))
        
    }
    
    lazy var iconView: UIImageView = {
        
        let iv = UIImageView(image: UIImage(named: "avatar_default_big"))
        iv.layer.masksToBounds = true
        iv.layer.cornerRadius = 45
        
        return iv
    }()

    lazy var messageLabel: UILabel = {
        let label = UILabel()
        label.text = "欢迎回来"
        label.sizeToFit()
        label.alpha = 0

        return label
    }()
}
